In addition, all patients will be given prophylactic anti-thrombotic treatment, either aspirin daily (commercial supply) if the patient has no prior history of thrombosis events or low molecular weight heparin according to hospital guidelines or physician preference. All prophylactic antithrombotic treatment unless contraindicated according to hospital guidelines or physician preference must be recorded. All patients will be monitored for signs and symptoms of venous thromboembolism while on Pomalidomide.